Door lock



DOOR LOCK Filed Dec. 24, 1926 4 Sheets-Sheet l 12 677271672 for:

A. WODARRA DOOR LOCK March 18, 1930.

Filed Dec. 24, 1926 4 Sheets-Sheet Marcl 18, 1930. A. WODARRA 1,751,184

noon LOCK Filed Dec. 24, 1926 4 Sheets-Sheet v 3 I I H 1113 March 18,1930.

A. WODARRA DOOR LOCK Filed Dec. 24, 1926 4 sheets sheet 4 c772 venfar:

Patented Mar. 18, 1930 PATENT OFFICE ADOLF WODARRA, F BERLIN LANKwlTz,GERMANY DOOR LOCK Application filed December 24, 1926, Serial No.156,916, and in Germany December 24, 1925.

means of a key or by means of a handle or 4 5 door knob. It has beenproposed to providcin case of such check-locks a key-hole which isarranged in the axis of the doorhandle itself in order to save space andin order to be able to construct the lock in a very compact manner.I-Teretofore, however,

the key-hole had been arranged in such a manner that the axis of thebore for the keyshaft and the axis of rotation of the door knob werecoincident with each other. The

path of motion of the keybit consequently was concentric to the axis ofthe door-handle. From this it follows that the tumblers of the lock mustproject into the range of action of the shaft of the door-handle,otherwise the key would have to be made exceedingly large. Inconsequence thereof a complete cam may not be used in connection withthese locks, because it would be impossible to insert said cam into thelock after the tumblers have fallen into their lower position.Therefore, instead of a complete cam, either se'gmentally-formed membersor complicated lever mechanisms heretofore have been used with theresult that locks of the present general type have been of a less ruggedconstruction than is often desired.

According to this invention a check-lock is provided which uses a cammounted upon its entire circumference yet avoiding the aforementioneddisadvantages by the fact that. the cam is penetrated by the key-holeand formed as a guiding member for the key-bit. The handle is mountedupon the front surfaces of the cam. The bore for the shaft of the keywhich bore passes through the cam is arranged eccentrically with respectto the axis of rotation of the cam so that the key-bit projects beyondthe circular circumference of the'cam during the greater part of itsmotion. A double-armed intermediately pivoted lever is pivotallyconnected to an arm of the cam, and said lever is adapted forco-operation with a spring pressed talonpivoted to the bolt. Thispicoted talon is adapted to be held above the intermediately pivotedlever by the key-bit during locking and unlocking movement of the bolt.

The safety-device consists preferably of a cam-shaft which is adjustablefrom the inclined lug provided on the interior side of the door, avhand-lever of the safety device engaging said lug, said hand-leverserving for rocking said cam-shaft. This safetydevice will preventunauthorized persons who have gained access to a room from leaving 0 theroom by merely turning the door-knob or handle. 1

According to this invention the problem of locking the door as well-asof providing a security against unauthorized opening of 5 the door issolved by the manner in which the safety-device and the locking deviceare united in one and the same lock. In the doorlock according to thisinvention the conditions for opening and closing the lock or the lockingof the door-lock are, therefore, dependent upon the position of thesafety-device.

In the accompanying drawings two forms of construction are shown as anexample of the device constructed according to this invention.

Figs. l-3 show one of said forms of construction of the door-lockaccording to this invention in a side-view with the front cover of thecasing partly broken away. These three figures represent the door-lockin different positions of the safety-device.

Fig. 4 shows the arrangement of the doorknob or handle upon the lateralsurface of the cam according to the first form of construction of thisinvention.

Figs. 5-9 show another form of construction of the novel door-lock andthe way of fastening the door-knob or handle to the cam.

' through the cam 13.

Fig. 5 more particularly shows the lock in a 1ateral view in unlockedcondition;

Fig. 6 more particularly is the same view of the lock in lockedcondition, In this case also the cover of the casing is partly removedin both Figures 5 and 6;

Fig. 7 is a section through the lock-bolt along the line 77 of Fig. 5;

Fig. 8 shows the cam together with the spring-latch in a front-view, and

Fig. 9 represents the second form of construction of the door-knob orhandle and the way in which said door-knob or handle is fastened to thecam.

In a casing 1 having lateral cover-plates 2 which are shown broken away,there is slidably mounted in the usual manner a bolt 3. This bolt is cutaway in the part which is positioned within the lock and in, proximityto the point of entrance into the bolt opening 4 of the face-plate 5 ofthe casing 1. A talon 7 is pivoted at 6, said talon being provided atits rearward end with a finger 8. This finger 8 co-operates. with adouble-armed intermediate lever 9 pivoted at 50. This intermediate leveris provided at its free end with a slot 11, said slot serving as a guidefor the pins which are provided at the end 12 of the swingable cam 10 ofthe cam. When depressing the door-handle as shown for instance at 15 inFig. 4, the swingable cam-arm 10 will move against the action of thespring 16, the double-lever 9 participating in the motion of said cam'arm. The key-hole 14 passes The talon 7, therefore, may be moved by Imeans of its finger 8 into or out of the range of action of theintermediate lever9. The talon may be provided with an oblique surfacein proximity to its pivot point, said sur face coming into contact withthe under edge of the window 4 when thebolt 3 is in locking position,whereby the talon 7 will be swung out of the range of action of saidintermediate lever 9 against the action of the catch- Spring 17. v

.Bositioned below the bolt 3 adjacent the front of the lock is asafety-device which comprises a shaft 18 which carries in differentplanes a rounded-out cam 19 and a pointed cam 20. The rounded-out cam 19serves for lifting the talon 7 for disengaging the hook 8 from lever 9,while the pointed cam 20 is designed to engage with the recesses orstops 21 during the locked position of the door-lock, said positionbeing described further below. The cam-shaft is preferably made ofrectangular cross-section at the places which project beyond the surfaceof the door. Upon, this rectangular part of the cam-shaft there isprovided a small lever 22 which may berotated into,the several positionsI, II and III. The usual tumblers 25 are jo'urnaled on a pivot 23 of aside-plate 24 of the casing 1 of the lock, said tumblers the bolt isprovided, are shown. The bolt itself is projected by a bolt-spring 30.

In the position I the round cam will engage the oblique surface of thetalon 7 thus swinging said talon out of the range of action of theintermediate lever 9. The bolt cannot, therefore,in this position of thesafety-lever be retracted by the handle 15, because the intermediatelever 9 will swing past and below the finger 8 of the talon. From theoutside, however, the bolt 3 may be retracted by means of a keywhich iscapable of operating the tumblers 25, the bit of said key retracting inthe usual manner the bolt by means of teeth 29.

The position I as above described is that position by which a securityis provided against opening the door by merely depressing the handle 15yet providing a possibility of opening the lock by the possessor of the'key from the .outside of the door.

If the depression of the door-handle 15 is intended to exert an actionupon the bolt 3, the talon 7 must be so constructed that it will beenabled to move into the range of action during its downward motion.This is accomplished by pressing the safety-lever 22 into thumb of theperson opening the door simultaneously with the depression of saiddoorhandle .(Fig. 2).

In position II the cam 19 allows the talon 7 to be depressed so thatduring swinging of the cam-arm 10 the intermediate lever 9 will retractthe bolt by means of its finger 8. The possibility of opening the lookfrom the outside by means of the'key will also be'present in this case.-I v In Fig. 3 the safety-lever 22 is shown in position III. In thisposition it has been raised upon the upper surface of the abovementionedsmall ascent and has carried the camshaft 18 with it and brought into aposition in which the pointed cam20 has fallen into one of thedepressions 21 of the bolt in its forwardly moved position.

The position III represents the condition of the lock for the purpose ofproviding safety at night. In this case, the lock cannot be opened withthe key fromthe outside nor from the inside of the door. Also thedoorlatch 15 in this position will not be able to operate the bolt.

In Fig. 4 there is shown a mode of fastening the door handle on the'lock according, to the first form of construction of the latter. In thiscase the removal of the door-handle on the outside of the door for thepurpose of unauthorized-opening of the lock will be renderedimpracticable by the fact that the means which permit the release of thedoorhandle are only accessible from the frontside of the door.

A cap 32 is placed upon a portion of the cam 13 which projectsexteriorly of the lock 8, said cam being formed in two parts connectedtogether by screws 31. The cap 32 is made integral with the door-handle15 and is provided with a flange 33 at its under surface, a forklikemember 35 having projecting parts as indicated at 34'may be slid overthe flange 33: Movement of the plate member 35 is accomplished by meansof a threaded spindle or screw 36 which threads through thefiange 38 ofplate member 35 and which is accessible from the front-side of the door.The flange 38 passes through a slot 37 which is provided in the sideplate of the lock. The door-handle and its cap, therefore, may only beremoved from the look when the door is in open condition.

The tumblers 25 may be employed in different numbers and their form andconstruction varied as desired.

The second form of the door-lock according to this invention is moresimple in its construction and has, therefore, certain advantages nothad in the first form of construction.

A bolt 42 is slidably mounted upon a rivet ed lug 43 in the lock casing41. The bolt 42 is constructed with a cross-section as shown in Fig. 7,in order'that the same may be reversed. A screw 48 serves for fasteninga nose 47 upon the bolt. The latter is pressed in the usual manner by aspring 49. The

usual tumblers, as well as a talon 51, are' vided for the purpose ofengaging the hook 55 with a lateral member 57 as shown in Fig. 8. Thecam 58 is formed in the same manner as in the first form of constructionabove described, and .contains a key-hole 59. The

- cam 58 is kept under the action of a spring 60 and may be rotated bymeans of the doorhandle so that the latch-lever 56 will make a properswinging motion and retract the bolt towards the right by engaging thehook 55 of the talon. For fastening the door-handle the cam is providedwith segmental recesses 61 to receive projections on the handleandscrew-holes 62 are provided in the cam for the screws 63 employed forfastening the handle to the cam. The open head 67 of the doorhandle 65carries on its under edge the catchmember 68.

The locking member in this form of construction is made as a locking camwhich may be adjusted to assume the two positions as shown in Figs. 5and 6. The talon 51 is provided with a recess to receive the lug -13, alug 66. projecting into said recess at the top thereof and lugs 64projecting into said recess at the bottom thereof for cooperation withsaid lug 43, the latter lug thus serving as a stop for the talon indifferent longitudinally and pivotally moved positions of the latter.-

The door-lock according to the second form of construction operates asfollows:

Assuming that a door equipped with the lock has simply been closedWithout having used the key for the forward motion of the bolt, the nose47 of the bolt will engage the opening for the bolt which is providedwithg in the post of the door. As shown in Fig. 5 the door-lock is inunlocked position with the locking member 54 disengaged from thepressure-surface 53 of the talon. -T he latter, however, rests with theupper edge of its recess upon the riveted lug '43, while the latchlever56 by means of its extension 57 is engaged with the book 55 of thetalon. If new the door-handle, (i5 is depressed and the shank rotatedtowards the right, the latch-lever 56 will swing towards the right andcarry the talon 51 and bolt 42 with it. The nose 47 of the bolt willthereby be retracted from the bolt-hole in the door-post and the doormay now immediately be opened.

According to Fig. 6 the door may not be opened from the outside onaccount of the fact that the locking-cam 54 has lifted the talon 51 bymeans of its pressure-surface 53. The hook 55 of the talon will,therefore, be positioned outside of the range of the latchlever 56 sothat any depressing of the latch will cause no effective change of theparts. The talon and hook 55 will fall back into the original positionso that the hook will enter into the range of action of the latch lever56 but not until the lockingcam 54 has been moved back into the positionaccording to Fig. 5 from the outside of the door.

The lock when in the position shown in Fig. 6 cannot be opened with thekey, because the tooth 64 of the talon 5 1 in the lifted position of thelatter will contact with the riveted lug 43. The lock, therefore, byreason of the position of the locking-cam 54 will be locked against anydepression of the door- Eandle as well as against the rotation of theloo The same conditions as shown in Figs. 5 I

and 6 are present if the bolt is moved forward by a single rotation ofthe key, the only 7 difference being that,,in this case the tooth 66 ofthe talon will be positioned at the righthand side of the riveted lug43. In this position the hook 55 of the talon will be moved forwardtowards the left, so that a pressure which is exerted upon thedoor-handle will be without any eifect.

In the locked condition shown in Fig. 6 the tooth 64 would be positionedin front of the riveted lug 43 if the bolt be moved forward by a singlerotation of the key; in the same manner as above described the tooth 66of the talon will be lifted above the riveted lug 43 and the hook 55will similarly be lifted above the latch-lever 56 as soon as the key-bitmoves along the pressure-surface 52 of the talon 51.

In order to provide a safety because the door of a room may not belocked from the inside the locking member may also be rebe taken out ofthe lock, the bit of said key acting ,upon the tumbler mechanism 53 ofthe talon 51.

I claim 4 1 A door-lock including a cam having a keyhole extendingtherethrough, said cam being adapted as a guiding member for the keybit,and having a key-shield upon the frontsurface of said cam, the bore ofthe keyhole for the shaft of the key being mounted eecentrically withrespect to the axis of said cam, and a safety device including a cam-"shaft adjustable from the inside of the lock,

a bolt and spring pressed talon thereon, said cam-shaft having camsadapted to move'the sprin pressed talon on the bolt.

2. door-lock including a cam havin keyhole extending therethrough, saidcam ing adapted as a guiding member for the key-bit, and having'akey-shield upon the front-surface of sald cam, the bore of'the placed bya special locking-key which may keyhole for the shaft of the key being"mounted eccentrically with respect to the axis of said cam, a latchlever formed integrally on the cam, a bolt having a talon cooperatingwith said latch lever adapted to make said bolt operable or inoperableas desired.

3. A door-lock including a cam having a keyhole extending therethrough,said cam, bemgadapted as a guiding member for thekey.- t, and having akey-shield upon the front-surface of said cam, the bore of the A keyholefor the shaft of the key being disposed eccentrically with respect tothe axis of said cam, a latch lever formed integrally on the cam, a lockbolt, a talon adapted to act as a locking means for said lock-bolt, alooking member, said talon being formed as a double tumbler mechanismwhich may be moved both by a key and by said locking member. Intestimony whereof I have aflixedmy signature.

- ADOLF WODARRA.

